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Electrical Machines

Electrical Machines
In synchronous motor the torque is proportional to

 Power P
 1/P
 1/P²
 P²

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 mechanical loss
 hysteresis loss
 temperature rise
 eddy-current loss

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Electrical Machines
DC generator will not build up voltage

 any one of above.
 if field resistance is more than critical resistance.
 due to wrong direction of rotation.
  if it has lost residual magnetism.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  star connection.
  delta connection.
  zig - zag connection.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs Ia
 Eg vs load current
 Vt vs load current
 Vt vs Ia

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 copper loss.
 eddy electric current loss.
 vibrations.
 hysteresis loss.

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MORE MCQ ON Electrical Machines

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